///|
/// Conservative pre-allocation cap for the native backend. Native cannot catch
/// OS-level overcommit faults (SIGSEGV), so large allocations that JS/wasm-gc
/// handle gracefully must be rejected here before the OS request is issued.
/// On non-native backends `alloc_cap_stub.mbt` defines the same name as
/// 1_073_741_824, preserving identical reject semantics on those targets.
let max_alloc_elems : Int = 134_217_728